Recognize comments in mutli-line argument lists

[rwstauner]

Vim doesn't currently highlight my comments, but puppet appears to recognize them (and I would sure hope it would).

Thanks!

[puppetcla]

Waiting for CLA signature by @rwstauner

@rwstauner - We require a Contributor License Agreement (CLA) for people who contribute to Puppet, but we have an easy click-through license with instructions, which is available at https://cla.puppetlabs.com/

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[rwstauner]

Patch seems trivial, but I was happy to sign (in the hopes of future contributions).

[puppetcla]

CLA signed by all contributors.